Solid state diffusion of only non-metal elements into metallic material surfaces Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating

CCHEMISTRY METALLURGY C23Surface treatment C23CCOATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL

C23C8/00Solid state diffusion of only non-metal elements into metallic material surfaces Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating

C23C8/02Pre-treatment of the material to be coated C23C8/04Treatment of selected surface areas C23C8/06using gases C23C8/08onyl one element being applied C23C8/10Oxidising C23C8/12using elemental oxygen or ozone C23C8/14Oxidising of ferrous surfaces C23C8/16using oxygen-containing compounds C23C8/18oxidising of ferrous surfaces C23C8/20Carburising C23C8/22of ferrous surfaces C23C8/24Nitriding C23C8/26of ferrous surfaces C23C8/28more than one element being applied in one step C23C8/30Carbo-nitriding C23C8/32of ferrous surfaces C23C8/34more than one element being applied in more than one step C23C8/36using ionised gases C23C8/38Treatment of ferrous surfaces C23C8/40using liquids C23C8/42only one element being applied C23C8/44Carburising C23C8/46of ferrous surfaces C23C8/48Nitriding C23C8/50of ferrous surfaces C23C8/52more than one element being applied in one step C23C8/54Carbo-nitriding C23C8/56of ferrous surfaces C23C8/58more than one element being applied in more than one step C23C8/60using solids C23C8/62only one element being applied C23C8/64Carburising C23C8/66of ferrous surfaces C23C8/68Boronising C23C8/70of ferrous surfaces C23C8/72more than one element being applied in one step C23C8/74Carbo-nitriding C23C8/76of ferrous surfaces C23C8/78more than one element being applied in more than one step C23C8/80After-treatment